挖改

双联拱隧道洞口明挖段改暗挖施工技术

Mined excavation replaced cut-and-cover for the portal section of a double-arch tunnel

明挖路基改浅埋隧道的设计与施工控制

The design and construction control of open excavation foundation changing shallow buried tunnel

新厂建设、老厂挖革改、新技术和新设备等开发研究，都应遵循这些基本原则。

These basic principles should be kept in building of new mills , reform of existing mills and development and investigation of new technologies and new equipments .

即将沉降较大一侧的一层地面下土体挖除，改为架空地面；

Namely soil is excavated under one-floor ground in superior subsidence side , and overhead plate is carried out on the ground ;

通过对仁用杏优良品种丰产栽培技术的探讨，认为仁用杏在较干旱的地区栽培时，首先要挖大坑深改土，并多施秸秆肥，改善土壤结构。

Digging big planting pit , fertilizing manure and improving soil structure are important measures to obtain high-yield of kernel-apricot in arid area .